diff options
Diffstat (limited to 'sys/dev/usb/usb_ethersubr.c')
| -rw-r--r-- | sys/dev/usb/usb_ethersubr.c | 148 |
1 files changed, 148 insertions, 0 deletions
diff --git a/sys/dev/usb/usb_ethersubr.c b/sys/dev/usb/usb_ethersubr.c new file mode 100644 index 0000000..4e8daf3 --- /dev/null +++ b/sys/dev/usb/usb_ethersubr.c @@ -0,0 +1,148 @@ +/* + * Copyright (c) 1997, 1998, 1999, 2000 + * Bill Paul <wpaul@ee.columbia.edu>. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by Bill Paul. + * 4. Neither the name of the author nor the names of any co-contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL Bill Paul OR THE VOICES IN HIS HEAD + * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF + * THE POSSIBILITY OF SUCH DAMAGE. + * + * $FreeBSD$ + */ + +/* + * Callbacks in the USB code operate at splusb() (actually splbio() + * in FreeBSD). However adding packets to the input queues has to be + * done at splimp(). It is conceivable that this arrangement could + * trigger a condition where the splimp() is ignored and the input + * queues could get trampled in spite of our best effors to prevent + * it. To work around this, we implement a special input queue for + * USB ethernet adapter drivers. Rather than passing the frames directly + * to ether_input(), we pass them here, then schedule a soft interrupt + * to hand them to ether_input() later, outside of the USB interrupt + * context. + * + * It's questional as to whether this code should be expanded to + * handle other kinds of devices, or handle USB transfer callbacks + * in general. Right now, I need USB network interfaces to work + * properly. + */ + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/sockio.h> +#include <sys/mbuf.h> +#include <sys/malloc.h> +#include <sys/socket.h> + +#include <net/if.h> +#include <net/if_types.h> +#include <net/if_arp.h> +#include <net/ethernet.h> +#include <net/netisr.h> +#include <net/bpf.h> + +#include <dev/usb/usb.h> +#include <dev/usb/usb_ethersubr.h> + +#ifndef lint +Static const char rcsid[] = + "$FreeBSD$"; +#endif + +Static struct ifqueue usbq_rx; +Static struct ifqueue usbq_tx; +Static int mtx_inited = 0; + +Static void usbintr (void); + +Static void usbintr() +{ + struct mbuf *m; + struct usb_qdat *q; + struct ifnet *ifp; + + /* Check the RX queue */ + while(1) { + IF_DEQUEUE(&usbq_rx, m); + if (m == NULL) + break; + q = (struct usb_qdat *)m->m_pkthdr.rcvif; + ifp = q->ifp; + m->m_pkthdr.rcvif = ifp; + (*ifp->if_input)(ifp, m); + + /* Re-arm the receiver */ + (*q->if_rxstart)(ifp); + if (ifp->if_snd.ifq_head != NULL) + (*ifp->if_start)(ifp); + } + + /* Check the TX queue */ + while(1) { + IF_DEQUEUE(&usbq_tx, m); + if (m == NULL) + break; + ifp = m->m_pkthdr.rcvif; + m_freem(m); + if (ifp->if_snd.ifq_head != NULL) + (*ifp->if_start)(ifp); + } + + return; +} + +void usb_register_netisr() +{ + if (mtx_inited) + return; + register_netisr(NETISR_USB, usbintr); + mtx_init(&usbq_tx.ifq_mtx, "usbq_tx_mtx", NULL, MTX_DEF); + mtx_init(&usbq_rx.ifq_mtx, "usbq_rx_mtx", NULL, MTX_DEF); + mtx_inited++; + return; +} + +/* + * Must be called at splusp() (actually splbio()). This should be + * the case when called from a transfer callback routine. + */ +void usb_ether_input(m) + struct mbuf *m; +{ + IF_ENQUEUE(&usbq_rx, m); + schednetisr(NETISR_USB); + + return; +} + +void usb_tx_done(m) + struct mbuf *m; +{ + IF_ENQUEUE(&usbq_tx, m); + schednetisr(NETISR_USB); + + return; +} |
